var Attacklab = Attacklab || {};

Attacklab.wmdBase = function () {

    // A few handy aliases for readability.
    var wmd = top.Attacklab;
    var doc = top.document;
    var re = top.RegExp;
    var nav = top.navigator;

    // Some namespaces.
    wmd.Util = {};
    wmd.Position = {};
    wmd.Command = {};
    wmd.Global = {};

    var util = wmd.Util;
    var position = wmd.Position;
    var command = wmd.Command;
    var global = wmd.Global;


    // Used to work around some browser bugs where we can't use feature testing.
    global.isIE = /msie/.test(nav.userAgent.toLowerCase());
    global.isIE_5or6 = /msie 6/.test(nav.userAgent.toLowerCase()) || /msie 5/.test(nav.userAgent.toLowerCase());
    global.isIE_7plus = global.isIE && !global.isIE_5or6;
    global.isOpera = /opera/.test(nav.userAgent.toLowerCase());
    global.isKonqueror = /konqueror/.test(nav.userAgent.toLowerCase());


    // -------------------------------------------------------------------
    //  YOUR CHANGES GO HERE
    //
    // I've tried to localize the things you are likely to change to 
    // this area.
    // -------------------------------------------------------------------

    // The text that appears on the upper part of the dialog box when
    // entering links.
    var imageDialogText = "<p style='margin-top: 0px'><b>Enter the image URL.</b></p><p>You can also add a title, which will be displayed as a tool tip.</p><p>Example:<br />http://wmd-editor.com/images/cloud1.jpg   \"Optional title\"</p>";
    var linkDialogText = "<p style='margin-top: 0px'><b>Enter the web address.</b></p><p>You can also use the name of the page for inter-page links.</p><p>Example:<br /><ul><li>http://foo.com/bar</li><li>my-page</li></ul></p>";

    // The default text that appears in the dialog input box when entering
    // links.
    var imageDefaultText = "";
    var linkDefaultText = "";

    // The location of your button images relative to the base directory.
    var imageDirectory = "/Content/Images/";

    // Some intervals in ms.  These can be adjusted to reduce the control's load.
    var previewPollInterval = 500;
    var pastePollInterval = 100;

    // The link and title for the help button
    var helpLink = "http://wmd-editor.com/";
    var helpHoverTitle = "WMD website";
    var helpTarget = "_blank";

    // -------------------------------------------------------------------
    //  END OF YOUR CHANGES
    // -------------------------------------------------------------------

    // A collection of the important regions on the page.
    // Cached so we don't have to keep traversing the DOM.
    wmd.PanelCollection = function () {
        this.buttonBar = doc.getElementById("wmd-button-bar");
        this.preview = doc.getElementById("wmd-preview");
        this.output = doc.getElementById("wmd-output");
        this.input = doc.getElementById("wmd-input");
    };

    // This PanelCollection object can't be filled until after the page
    // has loaded.
    wmd.panels = undefined;

    // Internet explorer has problems with CSS sprite buttons that use HTML
    // lists.  When you click on the background image "button", IE will 
    // select the non-existent link text and discard the selection in the
    // textarea.  The solution to this is to cache the textarea selection
    // on the button's mousedown event and set a flag.  In the part of the
    // code where we need to grab the selection, we check for the flag
    // and, if it's set, use the cached area instead of querying the
    // textarea.
    //
    // This ONLY affects Internet Explorer (tested on versions 6, 7
    // and 8) and ONLY on button clicks.  Keyboard shortcuts work
    // normally since the focus never leaves the textarea.
    wmd.ieCachedRange = null; 	// cached textarea selection
    wmd.ieRetardedClick = false; // flag

    // Returns true if the DOM element is visible, false if it's hidden.
    // Checks if display is anything other than none.
    util.isVisible = function (elem) {

        if (window.getComputedStyle) {
            // Most browsers
            return window.getComputedStyle(elem, null).getPropertyValue("display") !== "none";
        }
        else if (elem.currentStyle) {
            // IE
            return elem.currentStyle["display"] !== "none";
        }
    };


    // Adds a listener callback to a DOM element which is fired on a specified
    // event.
    util.addEvent = function (elem, event, listener) {
        if (elem.attachEvent) {
            // IE only.  The "on" is mandatory.
            elem.attachEvent("on" + event, listener);
        }
        else {
            // Other browsers.
            elem.addEventListener(event, listener, false);
        }
    };


    // Removes a listener callback from a DOM element which is fired on a specified
    // event.
    util.removeEvent = function (elem, event, listener) {
        if (elem.detachEvent) {
            // IE only.  The "on" is mandatory.
            elem.detachEvent("on" + event, listener);
        }
        else {
            // Other browsers.
            elem.removeEventListener(event, listener, false);
        }
    };

    // Converts \r\n and \r to \n.
    util.fixEolChars = function (text) {
        text = text.replace(/\r\n/g, "\n");
        text = text.replace(/\r/g, "\n");
        return text;
    };

    // Extends a regular expression.  Returns a new RegExp
    // using pre + regex + post as the expression.
    // Used in a few functions where we have a base
    // expression and we want to pre- or append some
    // conditions to it (e.g. adding "$" to the end).
    // The flags are unchanged.
    //
    // regex is a RegExp, pre and post are strings.
    util.extendRegExp = function (regex, pre, post) {

        if (pre === null || pre === undefined) {
            pre = "";
        }
        if (post === null || post === undefined) {
            post = "";
        }

        var pattern = regex.toString();
        var flags = "";

        // Replace the flags with empty space and store them.
        // Technically, this can match incorrect flags like "gmm".
        var result = pattern.match(/\/([gim]*)$/);
        if (result === null) {
            flags = result[0];
        }
        else {
            flags = "";
        }

        // Remove the flags and slash delimiters from the regular expression.
        pattern = pattern.replace(/(^\/|\/[gim]*$)/g, "");
        pattern = pre + pattern + post;

        return new RegExp(pattern, flags);
    }


    // Sets the image for a button passed to the WMD editor.
    // Returns a new element with the image attached.
    // Adds several style properties to the image.
    util.createImage = function (img) {

        var imgPath = imageDirectory + img;

        var elem = doc.createElement("img");
        elem.className = "wmd-button";
        elem.src = imgPath;

        return elem;
    };


    // This simulates a modal dialog box and asks for the URL when you
    // click the hyperlink or image buttons.
    //
    // text: The html for the input box.
    // defaultInputText: The default value that appears in the input box.
    // makeLinkMarkdown: The function which is executed when the prompt is dismissed, either via OK or Cancel
    util.prompt = function (text, defaultInputText, makeLinkMarkdown) {

        // These variables need to be declared at this level since they are used
        // in multiple functions.
        var dialog; 		// The dialog box.
        var background; 	// The background beind the dialog box.
        var input; 		// The text box where you enter the hyperlink.


        if (defaultInputText === undefined) {
            defaultInputText = "";
        }

        // Used as a keydown event handler. Esc dismisses the prompt.
        // Key code 27 is ESC.
        var checkEscape = function (key) {
            var code = (key.charCode || key.keyCode);
            if (code === 27) {
                close(true);
            }
        };

        // Dismisses the hyperlink input box.
        // isCancel is true if we don't care about the input text.
        // isCancel is false if we are going to keep the text.
        var close = function (isCancel) {
            util.removeEvent(doc.body, "keydown", checkEscape);
            var text = input.value;

            if (isCancel) {
                text = null;
            }
            else {
                // Fixes common pasting errors.
                text = text.replace('http://http://', 'http://');
                text = text.replace('http://https://', 'https://');
                text = text.replace('http://ftp://', 'ftp://');

                // Disabled so that we can just enter the name of a page as a relative link
                //                if (text.indexOf('http://') === -1 && text.indexOf('ftp://') === -1 && text.indexOf('https://') === -1) {
                //                    text = 'http://' + text;
                //                }
            }

            dialog.parentNode.removeChild(dialog);
            background.parentNode.removeChild(background);
            makeLinkMarkdown(text);
            return false;
        };

        // Creates the background behind the hyperlink text entry box.
        // Most of this has been moved to CSS but the div creation and
        // browser-specific hacks remain here.
        var createBackground = function () {

            background = doc.createElement("div");
            background.className = "wmd-prompt-background";
            style = background.style;
            style.position = "absolute";
            style.top = "0";

            style.zIndex = "1000";

            // Some versions of Konqueror don't support transparent colors
            // so we make the whole window transparent.
            //
            // Is this necessary on modern konqueror browsers?
            if (global.isKonqueror) {
                style.backgroundColor = "transparent";
            }
            else if (global.isIE) {
                style.filter = "alpha(opacity=50)";
            }
            else {
                style.opacity = "0.5";
            }

            var pageSize = position.getPageSize();
            style.height = pageSize[1] + "px";

            if (global.isIE) {
                style.left = doc.documentElement.scrollLeft;
                style.width = doc.documentElement.clientWidth;
            }
            else {
                style.left = "0";
                style.width = "100%";
            }

            doc.body.appendChild(background);
        };

        // Create the text input box form/window.
        var createDialog = function () {

            // The main dialog box.
            dialog = doc.createElement("div");
            dialog.className = "wmd-prompt-dialog";
            dialog.style.padding = "10px;";
            dialog.style.position = "fixed";
            dialog.style.width = "400px";
            dialog.style.zIndex = "1001";

            // The dialog text.
            var question = doc.createElement("div");
            question.innerHTML = text;
            question.style.padding = "5px";
            dialog.appendChild(question);

            // The web form container for the text box and buttons.
            var form = doc.createElement("form");
            form.onsubmit = function () { return close(false); };
            style = form.style;
            style.padding = "0";
            style.margin = "0";
            style.cssFloat = "left";
            style.width = "100%";
            style.textAlign = "center";
            style.position = "relative";
            dialog.appendChild(form);

            // The input text box
            input = doc.createElement("input");
            input.type = "text";
            input.value = defaultInputText;
            style = input.style;
            style.display = "block";
            style.width = "80%";
            style.marginLeft = style.marginRight = "auto";
            form.appendChild(input);

            // The ok button
            var okButton = doc.createElement("input");
            okButton.type = "button";
            okButton.onclick = function () { return close(false); };
            okButton.value = "OK";
            style = okButton.style;
            style.margin = "10px";
            style.display = "inline";
            style.width = "7em";


            // The cancel button
            var cancelButton = doc.createElement("input");
            cancelButton.type = "button";
            cancelButton.onclick = function () { return close(true); };
            cancelButton.value = "Cancel";
            style = cancelButton.style;
            style.margin = "10px";
            style.display = "inline";
            style.width = "7em";

            // The order of these buttons is different on macs.
            if (/mac/.test(nav.platform.toLowerCase())) {
                form.appendChild(cancelButton);
                form.appendChild(okButton);
            }
            else {
                form.appendChild(okButton);
                form.appendChild(cancelButton);
            }

            util.addEvent(doc.body, "keydown", checkEscape);
            dialog.style.top = "50%";
            dialog.style.left = "50%";
            dialog.style.display = "block";
            if (global.isIE_5or6) {
                dialog.style.position = "absolute";
                dialog.style.top = doc.documentElement.scrollTop + 200 + "px";
                dialog.style.left = "50%";
            }
            doc.body.appendChild(dialog);

            // This has to be done AFTER adding the dialog to the form if you
            // want it to be centered.
            dialog.style.marginTop = -(position.getHeight(dialog) / 2) + "px";
            dialog.style.marginLeft = -(position.getWidth(dialog) / 2) + "px";

        };

        createBackground();

        // Why is this in a zero-length timeout?
        // Is it working around a browser bug?
        top.setTimeout(function () {

            createDialog();

            var defTextLen = defaultInputText.length;
            if (input.selectionStart !== undefined) {
                input.selectionStart = 0;
                input.selectionEnd = defTextLen;
            }
            else if (input.createTextRange) {
                var range = input.createTextRange();
                range.collapse(false);
                range.moveStart("character", -defTextLen);
                range.moveEnd("character", defTextLen);
                range.select();
            }

            input.focus();
        }, 0);
    };


    // UNFINISHED
    // The assignment in the while loop makes jslint cranky.
    // I'll change it to a better loop later.
    position.getTop = function (elem, isInner) {
        var result = elem.offsetTop;
        if (!isInner) {
            while (elem = elem.offsetParent) {
                result += elem.offsetTop;
            }
        }
        return result;
    };

    position.getHeight = function (elem) {
        return elem.offsetHeight || elem.scrollHeight;
    };

    position.getWidth = function (elem) {
        return elem.offsetWidth || elem.scrollWidth;
    };

    position.getPageSize = function () {

        var scrollWidth, scrollHeight;
        var innerWidth, innerHeight;

        // It's not very clear which blocks work with which browsers.
        if (self.innerHeight && self.scrollMaxY) {
            scrollWidth = doc.body.scrollWidth;
            scrollHeight = self.innerHeight + self.scrollMaxY;
        }
        else if (doc.body.scrollHeight > doc.body.offsetHeight) {
            scrollWidth = doc.body.scrollWidth;
            scrollHeight = doc.body.scrollHeight;
        }
        else {
            scrollWidth = doc.body.offsetWidth;
            scrollHeight = doc.body.offsetHeight;
        }

        if (self.innerHeight) {
            // Non-IE browser
            innerWidth = self.innerWidth;
            innerHeight = self.innerHeight;
        }
        else if (doc.documentElement && doc.documentElement.clientHeight) {
            // Some versions of IE (IE 6 w/ a DOCTYPE declaration)
            innerWidth = doc.documentElement.clientWidth;
            innerHeight = doc.documentElement.clientHeight;
        }
        else if (doc.body) {
            // Other versions of IE
            innerWidth = doc.body.clientWidth;
            innerHeight = doc.body.clientHeight;
        }

        var maxWidth = Math.max(scrollWidth, innerWidth);
        var maxHeight = Math.max(scrollHeight, innerHeight);
        return [maxWidth, maxHeight, innerWidth, innerHeight];
    };

    // Watches the input textarea, polling at an interval and runs
    // a callback function if anything has changed.
    wmd.inputPoller = function (callback, interval) {

        var pollerObj = this;
        var inputArea = wmd.panels.input;

        // Stored start, end and text.  Used to see if there are changes to the input.
        var lastStart;
        var lastEnd;
        var markdown;

        var killHandle; // Used to cancel monitoring on destruction.
        // Checks to see if anything has changed in the textarea.
        // If so, it runs the callback.
        this.tick = function () {

            if (!util.isVisible(inputArea)) {
                return;
            }

            // Update the selection start and end, text.
            if (inputArea.selectionStart || inputArea.selectionStart === 0) {
                var start = inputArea.selectionStart;
                var end = inputArea.selectionEnd;
                if (start != lastStart || end != lastEnd) {
                    lastStart = start;
                    lastEnd = end;

                    if (markdown != inputArea.value) {
                        markdown = inputArea.value;
                        return true;
                    }
                }
            }
            return false;
        };


        var doTickCallback = function () {

            if (!util.isVisible(inputArea)) {
                return;
            }

            // If anything has changed, call the function.
            if (pollerObj.tick()) {
                callback();
            }
        };

        // Set how often we poll the textarea for changes.
        var assignInterval = function () {
            // previewPollInterval is set at the top of the namespace.
            killHandle = top.setInterval(doTickCallback, interval);
        };

        this.destroy = function () {
            top.clearInterval(killHandle);
        };

        assignInterval();
    };

    // Handles pushing and popping TextareaStates for undo/redo commands.
    // I should rename the stack variables to list.
    wmd.undoManager = function (callback) {

        var undoObj = this;
        var undoStack = []; // A stack of undo states
        var stackPtr = 0; // The index of the current state
        var mode = "none";
        var lastState; // The last state
        var poller;
        var timer; // The setTimeout handle for cancelling the timer
        var inputStateObj;

        // Set the mode for later logic steps.
        var setMode = function (newMode, noSave) {

            if (mode != newMode) {
                mode = newMode;
                if (!noSave) {
                    saveState();
                }
            }

            if (!global.isIE || mode != "moving") {
                timer = top.setTimeout(refreshState, 1);
            }
            else {
                inputStateObj = null;
            }
        };

        var refreshState = function () {
            inputStateObj = new wmd.TextareaState();
            poller.tick();
            timer = undefined;
        };

        this.setCommandMode = function () {
            mode = "command";
            saveState();
            timer = top.setTimeout(refreshState, 0);
        };

        this.canUndo = function () {
            return stackPtr > 1;
        };

        this.canRedo = function () {
            if (undoStack[stackPtr + 1]) {
                return true;
            }
            return false;
        };

        // Removes the last state and restores it.
        this.undo = function () {

            if (undoObj.canUndo()) {
                if (lastState) {
                    // What about setting state -1 to null or checking for undefined?
                    lastState.restore();
                    lastState = null;
                }
                else {
                    undoStack[stackPtr] = new wmd.TextareaState();
                    undoStack[--stackPtr].restore();

                    if (callback) {
                        callback();
                    }
                }
            }

            mode = "none";
            wmd.panels.input.focus();
            refreshState();
        };

        // Redo an action.
        this.redo = function () {

            if (undoObj.canRedo()) {

                undoStack[++stackPtr].restore();

                if (callback) {
                    callback();
                }
            }

            mode = "none";
            wmd.panels.input.focus();
            refreshState();
        };

        // Push the input area state to the stack.
        var saveState = function () {

            var currState = inputStateObj || new wmd.TextareaState();

            if (!currState) {
                return false;
            }
            if (mode == "moving") {
                if (!lastState) {
                    lastState = currState;
                }
                return;
            }
            if (lastState) {
                if (undoStack[stackPtr - 1].text != lastState.text) {
                    undoStack[stackPtr++] = lastState;
                }
                lastState = null;
            }
            undoStack[stackPtr++] = currState;
            undoStack[stackPtr + 1] = null;
            if (callback) {
                callback();
            }
        };

        var handleCtrlYZ = function (event) {

            var handled = false;

            if (event.ctrlKey || event.metaKey) {

                // IE and Opera do not support charCode.
                var keyCode = event.charCode || event.keyCode;
                var keyCodeChar = String.fromCharCode(keyCode);

                switch (keyCodeChar) {

                    case "y":
                        undoObj.redo();
                        handled = true;
                        break;

                    case "z":
                        if (!event.shiftKey) {
                            undoObj.undo();
                        }
                        else {
                            undoObj.redo();
                        }
                        handled = true;
                        break;
                }
            }

            if (handled) {
                if (event.preventDefault) {
                    event.preventDefault();
                }
                if (top.event) {
                    top.event.returnValue = false;
                }
                return;
            }
        };

        // Set the mode depending on what is going on in the input area.
        var handleModeChange = function (event) {

            if (!event.ctrlKey && !event.metaKey) {

                var keyCode = event.keyCode;

                if ((keyCode >= 33 && keyCode <= 40) || (keyCode >= 63232 && keyCode <= 63235)) {
                    // 33 - 40: page up/dn and arrow keys
                    // 63232 - 63235: page up/dn and arrow keys on safari
                    setMode("moving");
                }
                else if (keyCode == 8 || keyCode == 46 || keyCode == 127) {
                    // 8: backspace
                    // 46: delete
                    // 127: delete
                    setMode("deleting");
                }
                else if (keyCode == 13) {
                    // 13: Enter
                    setMode("newlines");
                }
                else if (keyCode == 27) {
                    // 27: escape
                    setMode("escape");
                }
                else if ((keyCode < 16 || keyCode > 20) && keyCode != 91) {
                    // 16-20 are shift, etc. 
                    // 91: left window key
                    // I think this might be a little messed up since there are
                    // a lot of nonprinting keys above 20.
                    setMode("typing");
                }
            }
        };

        var setEventHandlers = function () {

            util.addEvent(wmd.panels.input, "keypress", function (event) {
                // keyCode 89: y
                // keyCode 90: z
                if ((event.ctrlKey || event.metaKey) && (event.keyCode == 89 || event.keyCode == 90)) {
                    event.preventDefault();
                }
            });

            var handlePaste = function () {
                if (global.isIE || (inputStateObj && inputStateObj.text != wmd.panels.input.value)) {
                    if (timer == undefined) {
                        mode = "paste";
                        saveState();
                        refreshState();
                    }
                }
            };

            // pastePollInterval is specified at the beginning of this namespace.
            poller = new wmd.inputPoller(handlePaste, pastePollInterval);

            util.addEvent(wmd.panels.input, "keydown", handleCtrlYZ);
            util.addEvent(wmd.panels.input, "keydown", handleModeChange);

            util.addEvent(wmd.panels.input, "mousedown", function () {
                setMode("moving");
            });
            wmd.panels.input.onpaste = handlePaste;
            wmd.panels.input.ondrop = handlePaste;
        };

        var init = function () {
            setEventHandlers();
            refreshState();
            saveState();
        };

        this.destroy = function () {
            if (poller) {
                poller.destroy();
            }
        };

        init();
    };

    // I think my understanding of how the buttons and callbacks are stored in the array is incomplete.
    wmd.editor = function (previewRefreshCallback) {

        if (!previewRefreshCallback) {
            previewRefreshCallback = function () { };
        }

        var inputBox = wmd.panels.input;

        var offsetHeight = 0;

        var editObj = this;

        var mainDiv;
        var mainSpan;

        var div; // This name is pretty ambiguous.  I should rename this.

        // Used to cancel recurring events from setInterval.
        var creationHandle;

        var undoMgr; // The undo manager

        // Perform the button's action.
        var doClick = function (button) {

            inputBox.focus();

            if (button.textOp) {

                if (undoMgr) {
                    undoMgr.setCommandMode();
                }

                var state = new wmd.TextareaState();

                if (!state) {
                    return;
                }

                var chunks = state.getChunks();

                // Some commands launch a "modal" prompt dialog.  Javascript
                // can't really make a modal dialog box and the WMD code
                // will continue to execute while the dialog is displayed.
                // This prevents the dialog pattern I'm used to and means
                // I can't do something like this:
                //
                // var link = CreateLinkDialog();
                // makeMarkdownLink(link);
                // 
                // Instead of this straightforward method of handling a
                // dialog I have to pass any code which would execute
                // after the dialog is dismissed (e.g. link creation)
                // in a function parameter.
                //
                // Yes this is awkward and I think it sucks, but there's
                // no real workaround.  Only the image and link code
                // create dialogs and require the function pointers.
                var fixupInputArea = function () {

                    inputBox.focus();

                    if (chunks) {
                        state.setChunks(chunks);
                    }

                    state.restore();
                    previewRefreshCallback();
                };

                var useDefaultText = true;
                var noCleanup = button.textOp(chunks, fixupInputArea, useDefaultText);

                if (!noCleanup) {
                    fixupInputArea();
                }

            }

            if (button.execute) {
                button.execute(editObj);
            }
        };

        var setUndoRedoButtonStates = function () {
            if (undoMgr) {
                setupButton(document.getElementById("wmd-undo-button"), undoMgr.canUndo());
                setupButton(document.getElementById("wmd-redo-button"), undoMgr.canRedo());
            }
        };

        var setupButton = function (button, isEnabled) {

            var normalYShift = "0px";
            var disabledYShift = "-20px";
            var highlightYShift = "-40px";

            if (isEnabled) {
                button.style.backgroundPosition = button.XShift + " " + normalYShift;
                button.onmouseover = function () {
                    this.style.backgroundPosition = this.XShift + " " + highlightYShift;
                };

                button.onmouseout = function () {
                    this.style.backgroundPosition = this.XShift + " " + normalYShift;
                };

                // IE tries to select the background image "button" text (it's
                // implemented in a list item) so we have to cache the selection
                // on mousedown.
                if (global.isIE) {
                    button.onmousedown = function () {
                        wmd.ieRetardedClick = true;
                        wmd.ieCachedRange = document.selection.createRange();
                    };
                }

                if (!button.isHelp) {
                    button.onclick = function () {
                        if (this.onmouseout) {
                            this.onmouseout();
                        }
                        doClick(this);
                        return false;
                    }
                }
            }
            else {
                button.style.backgroundPosition = button.XShift + " " + disabledYShift;
                button.onmouseover = button.onmouseout = button.onclick = function () { };
            }
        }

        var makeSpritedButtonRow = function () {

            var buttonBar = document.getElementById("wmd-button-bar");

            var normalYShift = "0px";
            var disabledYShift = "-20px";
            var highlightYShift = "-40px";

            var buttonRow = document.createElement("ul");
            buttonRow.id = "wmd-button-row";
            buttonRow = buttonBar.appendChild(buttonRow);


            var boldButton = document.createElement("li");
            boldButton.className = "wmd-button";
            boldButton.id = "wmd-bold-button";
            boldButton.title = "Strong <strong> Ctrl+B";
            boldButton.XShift = "0px";
            boldButton.textOp = command.doBold;
            setupButton(boldButton, true);
            buttonRow.appendChild(boldButton);

            var italicButton = document.createElement("li");
            italicButton.className = "wmd-button";
            italicButton.id = "wmd-italic-button";
            italicButton.title = "Emphasis <em> Ctrl+I";
            italicButton.XShift = "-20px";
            italicButton.textOp = command.doItalic;
            setupButton(italicButton, true);
            buttonRow.appendChild(italicButton);

            var spacer1 = document.createElement("li");
            spacer1.className = "wmd-spacer";
            spacer1.id = "wmd-spacer1";
            buttonRow.appendChild(spacer1);

            var linkButton = document.createElement("li");
            linkButton.className = "wmd-button";
            linkButton.id = "wmd-link-button";
            linkButton.title = "Hyperlink <a> Ctrl+L";
            linkButton.XShift = "-40px";
            linkButton.textOp = function (chunk, postProcessing, useDefaultText) {
                return command.doLinkOrImage(chunk, postProcessing, false);
            };
            setupButton(linkButton, true);
            buttonRow.appendChild(linkButton);

            var quoteButton = document.createElement("li");
            quoteButton.className = "wmd-button";
            quoteButton.id = "wmd-quote-button";
            quoteButton.title = "Blockquote <blockquote> Ctrl+Q";
            quoteButton.XShift = "-60px";
            quoteButton.textOp = command.doBlockquote;
            setupButton(quoteButton, true);
            buttonRow.appendChild(quoteButton);

            var codeButton = document.createElement("li");
            codeButton.className = "wmd-button";
            codeButton.id = "wmd-code-button";
            codeButton.title = "Code Sample <pre><code> Ctrl+K";
            codeButton.XShift = "-80px";
            codeButton.textOp = command.doCode;
            setupButton(codeButton, true);
            buttonRow.appendChild(codeButton);

            var imageButton = document.createElement("li");
            imageButton.className = "wmd-button";
            imageButton.id = "wmd-image-button";
            imageButton.title = "Image <img> Ctrl+G";
            imageButton.XShift = "-100px";
            imageButton.textOp = function (chunk, postProcessing, useDefaultText) {
                return command.doLinkOrImage(chunk, postProcessing, true);
            };
            setupButton(imageButton, true);
            buttonRow.appendChild(imageButton);

            var spacer2 = document.createElement("li");
            spacer2.className = "wmd-spacer";
            spacer2.id = "wmd-spacer2";
            buttonRow.appendChild(spacer2);

            var olistButton = document.createElement("li");
            olistButton.className = "wmd-button";
            olistButton.id = "wmd-olist-button";
            olistButton.title = "Numbered List <ol> Ctrl+O";
            olistButton.XShift = "-120px";
            olistButton.textOp = function (chunk, postProcessing, useDefaultText) {
                command.doList(chunk, postProcessing, true, useDefaultText);
            };
            setupButton(olistButton, true);
            buttonRow.appendChild(olistButton);

            var ulistButton = document.createElement("li");
            ulistButton.className = "wmd-button";
            ulistButton.id = "wmd-ulist-button";
            ulistButton.title = "Bulleted List <ul> Ctrl+U";
            ulistButton.XShift = "-140px";
            ulistButton.textOp = function (chunk, postProcessing, useDefaultText) {
                command.doList(chunk, postProcessing, false, useDefaultText);
            };
            setupButton(ulistButton, true);
            buttonRow.appendChild(ulistButton);

            var headingButton = document.createElement("li");
            headingButton.className = "wmd-button";
            headingButton.id = "wmd-heading-button";
            headingButton.title = "Heading <h1>/<h2> Ctrl+H";
            headingButton.XShift = "-160px";
            headingButton.textOp = command.doHeading;
            setupButton(headingButton, true);
            buttonRow.appendChild(headingButton);

            var hrButton = document.createElement("li");
            hrButton.className = "wmd-button";
            hrButton.id = "wmd-hr-button";
            hrButton.title = "Horizontal Rule <hr> Ctrl+R";
            hrButton.XShift = "-180px";
            hrButton.textOp = command.doHorizontalRule;
            setupButton(hrButton, true);
            buttonRow.appendChild(hrButton);

            var spacer3 = document.createElement("li");
            spacer3.className = "wmd-spacer";
            spacer3.id = "wmd-spacer3";
            buttonRow.appendChild(spacer3);

            var undoButton = document.createElement("li");
            undoButton.className = "wmd-button";
            undoButton.id = "wmd-undo-button";
            undoButton.title = "Undo - Ctrl+Z";
            undoButton.XShift = "-200px";
            undoButton.execute = function (manager) {
                manager.undo();
            };
            setupButton(undoButton, true);
            buttonRow.appendChild(undoButton);

            var redoButton = document.createElement("li");
            redoButton.className = "wmd-button";
            redoButton.id = "wmd-redo-button";
            redoButton.title = "Redo - Ctrl+Y";
            if (/win/.test(nav.platform.toLowerCase())) {
                redoButton.title = "Redo - Ctrl+Y";
            }
            else {
                // mac and other non-Windows platforms
                redoButton.title = "Redo - Ctrl+Shift+Z";
            }
            redoButton.XShift = "-220px";
            redoButton.execute = function (manager) {
                manager.redo();
            };
            setupButton(redoButton, true);
            buttonRow.appendChild(redoButton);

            var helpButton = document.createElement("li");
            helpButton.className = "wmd-button";
            helpButton.id = "wmd-help-button";
            helpButton.XShift = "-240px";
            helpButton.isHelp = true;

            var helpAnchor = document.createElement("a");
            helpAnchor.href = helpLink;
            helpAnchor.target = helpTarget
            helpAnchor.title = helpHoverTitle;
            helpButton.appendChild(helpAnchor);

            setupButton(helpButton, true);
            buttonRow.appendChild(helpButton);

            setUndoRedoButtonStates();
        }

        var setupEditor = function () {

            if (/\?noundo/.test(doc.location.href)) {
                wmd.nativeUndo = true;
            }

            if (!wmd.nativeUndo) {
                undoMgr = new wmd.undoManager(function () {
                    previewRefreshCallback();
                    setUndoRedoButtonStates();
                });
            }

            makeSpritedButtonRow();


            var keyEvent = "keydown";
            if (global.isOpera) {
                keyEvent = "keypress";
            }

            util.addEvent(inputBox, keyEvent, function (key) {

                // Check to see if we have a button key and, if so execute the callback.
                if (key.ctrlKey || key.metaKey) {

                    var keyCode = key.charCode || key.keyCode;
                    var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();

                    switch (keyCodeStr) {
                        case "b":
                            doClick(document.getElementById("wmd-bold-button"));
                            break;
                        case "i":
                            doClick(document.getElementById("wmd-italic-button"));
                            break;
                        case "l":
                            doClick(document.getElementById("wmd-link-button"));
                            break;
                        case "q":
                            doClick(document.getElementById("wmd-quote-button"));
                            break;
                        case "k":
                            doClick(document.getElementById("wmd-code-button"));
                            break;
                        case "g":
                            doClick(document.getElementById("wmd-image-button"));
                            break;
                        case "o":
                            doClick(document.getElementById("wmd-olist-button"));
                            break;
                        case "u":
                            doClick(document.getElementById("wmd-ulist-button"));
                            break;
                        case "h":
                            doClick(document.getElementById("wmd-heading-button"));
                            break;
                        case "r":
                            doClick(document.getElementById("wmd-hr-button"));
                            break;
                        case "y":
                            doClick(document.getElementById("wmd-redo-button"));
                            break;
                        case "z":
                            if (key.shiftKey) {
                                doClick(document.getElementById("wmd-redo-button"));
                            }
                            else {
                                doClick(document.getElementById("wmd-undo-button"));
                            }
                            break;
                        default:
                            return;
                    }


                    if (key.preventDefault) {
                        key.preventDefault();
                    }

                    if (top.event) {
                        top.event.returnValue = false;
                    }
                }
            });

            // Disable ESC clearing the input textarea on IE
            if (global.isIE) {
                util.addEvent(inputBox, "keydown", function (key) {
                    var code = key.keyCode;
                    // Key code 27 is ESC
                    if (code === 27) {
                        return false;
                    }
                });
            }

            if (inputBox.form) {
                var submitCallback = inputBox.form.onsubmit;
                inputBox.form.onsubmit = function () {
                    // DISABLED: We want to save as Markdown
                    //convertToHtml();
                    if (submitCallback) {
                        return submitCallback.apply(this, arguments);
                    }
                };
            }
        };

        // Convert the contents of the input textarea to HTML in the output/preview panels.
        var convertToHtml = function () {

            if (wmd.showdown) {
                var markdownConverter = new wmd.showdown.converter();
            }
            var text = inputBox.value;

            var callback = function () {
                inputBox.value = text;
            };

            if (!/markdown/.test(wmd.wmd_env.output.toLowerCase())) {
                if (markdownConverter) {
                    inputBox.value = markdownConverter.makeHtml(text);
                    top.setTimeout(callback, 0);
                }
            }
            return true;
        };


        this.undo = function () {
            if (undoMgr) {
                undoMgr.undo();
            }
        };

        this.redo = function () {
            if (undoMgr) {
                undoMgr.redo();
            }
        };

        // This is pretty useless.  The setupEditor function contents
        // should just be copied here.
        var init = function () {
            setupEditor();
        };

        this.destroy = function () {
            if (undoMgr) {
                undoMgr.destroy();
            }
            if (div.parentNode) {
                div.parentNode.removeChild(div);
            }
            if (inputBox) {
                inputBox.style.marginTop = "";
            }
            top.clearInterval(creationHandle);
        };

        init();
    };

    // The input textarea state/contents.
    // This is used to implement undo/redo by the undo manager.
    wmd.TextareaState = function () {

        // Aliases
        var stateObj = this;
        var inputArea = wmd.panels.input;

        this.init = function () {

            if (!util.isVisible(inputArea)) {
                return;
            }

            this.setInputAreaSelectionStartEnd();
            this.scrollTop = inputArea.scrollTop;
            if (!this.text && inputArea.selectionStart || inputArea.selectionStart === 0) {
                this.text = inputArea.value;
            }

        }

        // Sets the selected text in the input box after we've performed an
        // operation.
        this.setInputAreaSelection = function () {

            if (!util.isVisible(inputArea)) {
                return;
            }

            if (inputArea.selectionStart !== undefined && !global.isOpera) {

                inputArea.focus();
                inputArea.selectionStart = stateObj.start;
                inputArea.selectionEnd = stateObj.end;
                inputArea.scrollTop = stateObj.scrollTop;
            }
            else if (doc.selection) {

                if (doc.activeElement && doc.activeElement !== inputArea) {
                    return;
                }

                inputArea.focus();
                var range = inputArea.createTextRange();
                range.moveStart("character", -inputArea.value.length);
                range.moveEnd("character", -inputArea.value.length);
                range.moveEnd("character", stateObj.end);
                range.moveStart("character", stateObj.start);
                range.select();
            }
        };

        this.setInputAreaSelectionStartEnd = function () {

            if (inputArea.selectionStart || inputArea.selectionStart === 0) {

                stateObj.start = inputArea.selectionStart;
                stateObj.end = inputArea.selectionEnd;
            }
            else if (doc.selection) {

                stateObj.text = util.fixEolChars(inputArea.value);

                // IE loses the selection in the textarea when buttons are
                // clicked.  On IE we cache the selection and set a flag
                // which we check for here.
                var range;
                if (wmd.ieRetardedClick && wmd.ieCachedRange) {
                    range = wmd.ieCachedRange;
                    wmd.ieRetardedClick = false;
                }
                else {
                    range = doc.selection.createRange();
                }

                var fixedRange = util.fixEolChars(range.text);
                var marker = "\x07";
                var markedRange = marker + fixedRange + marker;
                range.text = markedRange;
                var inputText = util.fixEolChars(inputArea.value);

                range.moveStart("character", -markedRange.length);
                range.text = fixedRange;

                stateObj.start = inputText.indexOf(marker);
                stateObj.end = inputText.lastIndexOf(marker) - marker.length;

                var len = stateObj.text.length - util.fixEolChars(inputArea.value).length;

                if (len) {
                    range.moveStart("character", -fixedRange.length);
                    while (len--) {
                        fixedRange += "\n";
                        stateObj.end += 1;
                    }
                    range.text = fixedRange;
                }

                this.setInputAreaSelection();
            }
        };

        // Restore this state into the input area.
        this.restore = function () {

            if (stateObj.text != undefined && stateObj.text != inputArea.value) {
                inputArea.value = stateObj.text;
            }
            this.setInputAreaSelection();
            inputArea.scrollTop = stateObj.scrollTop;
        };

        // Gets a collection of HTML chunks from the inptut textarea.
        this.getChunks = function () {

            var chunk = new wmd.Chunks();

            chunk.before = util.fixEolChars(stateObj.text.substring(0, stateObj.start));
            chunk.startTag = "";
            chunk.selection = util.fixEolChars(stateObj.text.substring(stateObj.start, stateObj.end));
            chunk.endTag = "";
            chunk.after = util.fixEolChars(stateObj.text.substring(stateObj.end));
            chunk.scrollTop = stateObj.scrollTop;

            return chunk;
        };

        // Sets the TextareaState properties given a chunk of markdown.
        this.setChunks = function (chunk) {

            chunk.before = chunk.before + chunk.startTag;
            chunk.after = chunk.endTag + chunk.after;

            if (global.isOpera) {
                chunk.before = chunk.before.replace(/\n/g, "\r\n");
                chunk.selection = chunk.selection.replace(/\n/g, "\r\n");
                chunk.after = chunk.after.replace(/\n/g, "\r\n");
            }

            this.start = chunk.before.length;
            this.end = chunk.before.length + chunk.selection.length;
            this.text = chunk.before + chunk.selection + chunk.after;
            this.scrollTop = chunk.scrollTop;
        };

        this.init();
    };

    // before: contains all the text in the input box BEFORE the selection.
    // after: contains all the text in the input box AFTER the selection.
    wmd.Chunks = function () {
    };

    // startRegex: a regular expression to find the start tag
    // endRegex: a regular expresssion to find the end tag
    wmd.Chunks.prototype.findTags = function (startRegex, endRegex) {

        var chunkObj = this;
        var regex;

        if (startRegex) {

            regex = util.extendRegExp(startRegex, "", "$");

            this.before = this.before.replace(regex,
				function (match) {
				    chunkObj.startTag = chunkObj.startTag + match;
				    return "";
				});

            regex = util.extendRegExp(startRegex, "^", "");

            this.selection = this.selection.replace(regex,
				function (match) {
				    chunkObj.startTag = chunkObj.startTag + match;
				    return "";
				});
        }

        if (endRegex) {

            regex = util.extendRegExp(endRegex, "", "$");

            this.selection = this.selection.replace(regex,
				function (match) {
				    chunkObj.endTag = match + chunkObj.endTag;
				    return "";
				});

            regex = util.extendRegExp(endRegex, "^", "");

            this.after = this.after.replace(regex,
				function (match) {
				    chunkObj.endTag = match + chunkObj.endTag;
				    return "";
				});
        }
    };

    // If remove is false, the whitespace is transferred
    // to the before/after regions.
    //
    // If remove is true, the whitespace disappears.
    wmd.Chunks.prototype.trimWhitespace = function (remove) {

        var originalLength = this.selection.length;
        this.selection = this.selection.replace(/^(\s*)/, "");
        var whitespace = originalLength - this.selection.length;

        if (!remove) {
            for (var i = 0; i < whitespace; i++) {
                this.before += " ";
            }
        }

        originalLength = this.selection.length;
        this.selection = this.selection.replace(/(\s*)$/, "");
        whitespace = originalLength - this.selection.length;

        if (!remove) {
            for (var i = 0; i < whitespace; i++) {
                this.after = " " + this.after;
            }
        }
    };


    wmd.Chunks.prototype.addBlankLines = function (nLinesBefore, nLinesAfter, findExtraNewlines) {

        if (nLinesBefore === undefined) {
            nLinesBefore = 1;
        }

        if (nLinesAfter === undefined) {
            nLinesAfter = 1;
        }

        nLinesBefore++;
        nLinesAfter++;

        var regexText;
        var replacementText;

        this.selection = this.selection.replace(/(^\n*)/, "");
        this.startTag = this.startTag + re.$1;
        this.selection = this.selection.replace(/(\n*$)/, "");
        this.endTag = this.endTag + re.$1;
        this.startTag = this.startTag.replace(/(^\n*)/, "");
        this.before = this.before + re.$1;
        this.endTag = this.endTag.replace(/(\n*$)/, "");
        this.after = this.after + re.$1;

        if (this.before) {

            regexText = replacementText = "";

            while (nLinesBefore--) {
                regexText += "\\n?";
                replacementText += "\n";
            }

            if (findExtraNewlines) {
                regexText = "\\n*";
            }
            this.before = this.before.replace(new re(regexText + "$", ""), replacementText);
        }

        if (this.after) {

            regexText = replacementText = "";

            while (nLinesAfter--) {
                regexText += "\\n?";
                replacementText += "\n";
            }
            if (findExtraNewlines) {
                regexText = "\\n*";
            }

            this.after = this.after.replace(new re(regexText, ""), replacementText);
        }
    };

    // The markdown symbols - 4 spaces = code, > = blockquote, etc.
    command.prefixes = "(?:\\s{4,}|\\s*>|\\s*-\\s+|\\s*\\d+\\.|=|\\+|-|_|\\*|#|\\s*\\[[^\n]]+\\]:)";

    // Remove markdown symbols from the chunk selection.
    command.unwrap = function (chunk) {
        var txt = new re("([^\\n])\\n(?!(\\n|" + command.prefixes + "))", "g");
        chunk.selection = chunk.selection.replace(txt, "$1 $2");
    };

    command.wrap = function (chunk, len) {
        command.unwrap(chunk);
        var regex = new re("(.{1," + len + "})( +|$\\n?)", "gm");

        chunk.selection = chunk.selection.replace(regex, function (line, marked) {
            if (new re("^" + command.prefixes, "").test(line)) {
                return line;
            }
            return marked + "\n";
        });

        chunk.selection = chunk.selection.replace(/\s+$/, "");
    };

    command.doBold = function (chunk, postProcessing, useDefaultText) {
        return command.doBorI(chunk, 2, "strong text");
    };

    command.doItalic = function (chunk, postProcessing, useDefaultText) {
        return command.doBorI(chunk, 1, "emphasized text");
    };

    // chunk: The selected region that will be enclosed with */**
    // nStars: 1 for italics, 2 for bold
    // insertText: If you just click the button without highlighting text, this gets inserted
    command.doBorI = function (chunk, nStars, insertText) {

        // Get rid of whitespace and fixup newlines.
        chunk.trimWhitespace();
        chunk.selection = chunk.selection.replace(/\n{2,}/g, "\n");

        // Look for stars before and after.  Is the chunk already marked up?
        chunk.before.search(/(\**$)/);
        var starsBefore = re.$1;

        chunk.after.search(/(^\**)/);
        var starsAfter = re.$1;

        var prevStars = Math.min(starsBefore.length, starsAfter.length);

        // Remove stars if we have to since the button acts as a toggle.
        if ((prevStars >= nStars) && (prevStars != 2 || nStars != 1)) {
            chunk.before = chunk.before.replace(re("[*]{" + nStars + "}$", ""), "");
            chunk.after = chunk.after.replace(re("^[*]{" + nStars + "}", ""), "");
        }
        else if (!chunk.selection && starsAfter) {
            // It's not really clear why this code is necessary.  It just moves
            // some arbitrary stuff around.
            chunk.after = chunk.after.replace(/^([*_]*)/, "");
            chunk.before = chunk.before.replace(/(\s?)$/, "");
            var whitespace = re.$1;
            chunk.before = chunk.before + starsAfter + whitespace;
        }
        else {

            // In most cases, if you don't have any selected text and click the button
            // you'll get a selected, marked up region with the default text inserted.
            if (!chunk.selection && !starsAfter) {
                chunk.selection = insertText;
            }

            // Add the true markup.
            var markup = nStars <= 1 ? "*" : "**"; // shouldn't the test be = ?
            chunk.before = chunk.before + markup;
            chunk.after = markup + chunk.after;
        }

        return;
    };

    command.stripLinkDefs = function (text, defsToAdd) {

        text = text.replace(/^[ ]{0,3}\[(\d+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|$)/gm,
			function (totalMatch, id, link, newlines, title) {
			    defsToAdd[id] = totalMatch.replace(/\s*$/, "");
			    if (newlines) {
			        // Strip the title and return that separately.
			        defsToAdd[id] = totalMatch.replace(/["(](.+?)[")]$/, "");
			        return newlines + title;
			    }
			    return "";
			});

        return text;
    };

    command.addLinkDef = function (chunk, linkDef) {

        var refNumber = 0; // The current reference number
        var defsToAdd = {}; //
        // Start with a clean slate by removing all previous link definitions.
        chunk.before = command.stripLinkDefs(chunk.before, defsToAdd);
        chunk.selection = command.stripLinkDefs(chunk.selection, defsToAdd);
        chunk.after = command.stripLinkDefs(chunk.after, defsToAdd);

        var defs = "";
        var regex = /(\[(?:\[[^\]]*\]|[^\[\]])*\][ ]?(?:\n[ ]*)?\[)(\d+)(\])/g;

        var addDefNumber = function (def) {
            refNumber++;
            def = def.replace(/^[ ]{0,3}\[(\d+)\]:/, "  [" + refNumber + "]:");
            defs += "\n" + def;
        };

        var getLink = function (wholeMatch, link, id, end) {

            if (defsToAdd[id]) {
                addDefNumber(defsToAdd[id]);
                return link + refNumber + end;

            }
            return wholeMatch;
        };

        chunk.before = chunk.before.replace(regex, getLink);

        if (linkDef) {
            addDefNumber(linkDef);
        }
        else {
            chunk.selection = chunk.selection.replace(regex, getLink);
        }

        var refOut = refNumber;

        chunk.after = chunk.after.replace(regex, getLink);

        if (chunk.after) {
            chunk.after = chunk.after.replace(/\n*$/, "");
        }
        if (!chunk.after) {
            chunk.selection = chunk.selection.replace(/\n*$/, "");
        }

        chunk.after += "\n\n" + defs;

        return refOut;
    };

    command.doLinkOrImage = function (chunk, postProcessing, isImage) {

        chunk.trimWhitespace();
        chunk.findTags(/\s*!?\[/, /\][ ]?(?:\n[ ]*)?(\[.*?\])?/);

        if (chunk.endTag.length > 1) {

            chunk.startTag = chunk.startTag.replace(/!?\[/, "");
            chunk.endTag = "";
            command.addLinkDef(chunk, null);

        }
        else {

            if (/\n\n/.test(chunk.selection)) {
                command.addLinkDef(chunk, null);
                return;
            }

            // The function to be executed when you enter a link and press OK or Cancel.
            // Marks up the link and adds the ref.
            var makeLinkMarkdown = function (link) {

                if (link !== null) {

                    chunk.startTag = chunk.endTag = "";
                    var linkDef = " [999]: " + link;

                    var num = command.addLinkDef(chunk, linkDef);
                    chunk.startTag = isImage ? "![" : "[";
                    chunk.endTag = "][" + num + "]";

                    if (!chunk.selection) {
                        if (isImage) {
                            chunk.selection = "alt text";
                        }
                        else {
                            chunk.selection = "link text";
                        }
                    }
                }
                postProcessing();
            };

            if (isImage) {
                util.prompt(imageDialogText, imageDefaultText, makeLinkMarkdown);
            }
            else {
                util.prompt(linkDialogText, linkDefaultText, makeLinkMarkdown);
            }
            return true;
        }
    };

    util.makeAPI = function () {
        wmd.wmd = {};
        wmd.wmd.editor = wmd.editor;
        wmd.wmd.previewManager = wmd.previewManager;
    };

    util.startEditor = function () {

        if (wmd.wmd_env.autostart === false) {
            util.makeAPI();
            return;
        }

        var edit; 	// The editor (buttons + input + outputs) - the main object.
        var previewMgr; // The preview manager.

        // Fired after the page has fully loaded.
        var loadListener = function () {

            wmd.panels = new wmd.PanelCollection();

            previewMgr = new wmd.previewManager();
            var previewRefreshCallback = previewMgr.refresh;

            edit = new wmd.editor(previewRefreshCallback);

            previewMgr.refresh(true);

        };

        util.addEvent(top, "load", loadListener);
    };

    wmd.previewManager = function () {

        var managerObj = this;
        var converter;
        var poller;
        var timeout;
        var elapsedTime;
        var oldInputText;
        var htmlOut;
        var maxDelay = 3000;
        var startType = "delayed"; // The other legal value is "manual"

        // Adds event listeners to elements and creates the input poller.
        var setupEvents = function (inputElem, listener) {

            util.addEvent(inputElem, "input", listener);
            inputElem.onpaste = listener;
            inputElem.ondrop = listener;

            util.addEvent(inputElem, "keypress", listener);
            util.addEvent(inputElem, "keydown", listener);
            // previewPollInterval is set at the top of this file.
            poller = new wmd.inputPoller(listener, previewPollInterval);
        };

        var getDocScrollTop = function () {

            var result = 0;

            if (top.innerHeight) {
                result = top.pageYOffset;
            }
            else
                if (doc.documentElement && doc.documentElement.scrollTop) {
                    result = doc.documentElement.scrollTop;
                }
                else
                    if (doc.body) {
                        result = doc.body.scrollTop;
                    }

            return result;
        };

        var makePreviewHtml = function () {

            // If there are no registered preview and output panels
            // there is nothing to do.
            if (!wmd.panels.preview && !wmd.panels.output) {
                return;
            }

            var text = wmd.panels.input.value;
            if (text && text == oldInputText) {
                return; // Input text hasn't changed.
            }
            else {
                oldInputText = text;
            }

            var prevTime = new Date().getTime();

            if (!converter && wmd.showdown) {
                converter = new wmd.showdown.converter();
            }

            if (converter) {
                text = converter.makeHtml(text);
            }

            // Calculate the processing time of the HTML creation.
            // It's used as the delay time in the event listener.
            var currTime = new Date().getTime();
            elapsedTime = currTime - prevTime;

            pushPreviewHtml(text);
            htmlOut = text;
        };

        // setTimeout is already used.  Used as an event listener.
        var applyTimeout = function () {

            if (timeout) {
                top.clearTimeout(timeout);
                timeout = undefined;
            }

            if (startType !== "manual") {

                var delay = 0;

                if (startType === "delayed") {
                    delay = elapsedTime;
                }

                if (delay > maxDelay) {
                    delay = maxDelay;
                }
                timeout = top.setTimeout(makePreviewHtml, delay);
            }
        };

        var getScaleFactor = function (panel) {
            if (panel.scrollHeight <= panel.clientHeight) {
                return 1;
            }
            return panel.scrollTop / (panel.scrollHeight - panel.clientHeight);
        };

        var setPanelScrollTops = function () {

            if (wmd.panels.preview) {
                wmd.panels.preview.scrollTop = (wmd.panels.preview.scrollHeight - wmd.panels.preview.clientHeight) * getScaleFactor(wmd.panels.preview);
                ;
            }

            if (wmd.panels.output) {
                wmd.panels.output.scrollTop = (wmd.panels.output.scrollHeight - wmd.panels.output.clientHeight) * getScaleFactor(wmd.panels.output);
                ;
            }
        };

        this.refresh = function (requiresRefresh) {

            if (requiresRefresh) {
                oldInputText = "";
                makePreviewHtml();
            }
            else {
                applyTimeout();
            }
        };

        this.processingTime = function () {
            return elapsedTime;
        };

        // The output HTML
        this.output = function () {
            return htmlOut;
        };

        // The mode can be "manual" or "delayed"
        this.setUpdateMode = function (mode) {
            startType = mode;
            managerObj.refresh();
        };

        var isFirstTimeFilled = true;

        var pushPreviewHtml = function (text) {

            var emptyTop = position.getTop(wmd.panels.input) - getDocScrollTop();

            // Send the encoded HTML to the output textarea/div.
            if (wmd.panels.output) {
                // The value property is only defined if the output is a textarea.
                if (wmd.panels.output.value !== undefined) {
                    wmd.panels.output.value = text;
                    wmd.panels.output.readOnly = true;
                }
                // Otherwise we are just replacing the text in a div.
                // Send the HTML wrapped in <pre><code>
                else {
                    var newText = text.replace(/&/g, "&amp;");
                    newText = newText.replace(/</g, "&lt;");
                    wmd.panels.output.innerHTML = "<pre><code>" + newText + "</code></pre>";
                }
            }

            if (wmd.panels.preview) {
                wmd.panels.preview.innerHTML = text;
            }

            setPanelScrollTops();

            if (isFirstTimeFilled) {
                isFirstTimeFilled = false;
                return;
            }

            var fullTop = position.getTop(wmd.panels.input) - getDocScrollTop();

            if (global.isIE) {
                top.setTimeout(function () {
                    top.scrollBy(0, fullTop - emptyTop);
                }, 0);
            }
            else {
                top.scrollBy(0, fullTop - emptyTop);
            }
        };

        var init = function () {

            setupEvents(wmd.panels.input, applyTimeout);
            makePreviewHtml();

            if (wmd.panels.preview) {
                wmd.panels.preview.scrollTop = 0;
            }
            if (wmd.panels.output) {
                wmd.panels.output.scrollTop = 0;
            }
        };

        this.destroy = function () {
            if (poller) {
                poller.destroy();
            }
        };

        init();
    };

    // Moves the cursor to the next line and continues lists, quotes and code.
    command.doAutoindent = function (chunk, postProcessing, useDefaultText) {

        chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]*\n$/, "\n\n");
        chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}>[ \t]*\n$/, "\n\n");
        chunk.before = chunk.before.replace(/(\n|^)[ \t]+\n$/, "\n\n");

        useDefaultText = false;

        if (/(\n|^)[ ]{0,3}([*+-])[ \t]+.*\n$/.test(chunk.before)) {
            if (command.doList) {
                command.doList(chunk, postProcessing, false, true);
            }
        }
        if (/(\n|^)[ ]{0,3}(\d+[.])[ \t]+.*\n$/.test(chunk.before)) {
            if (command.doList) {
                command.doList(chunk, postProcessing, true, true);
            }
        }
        if (/(\n|^)[ ]{0,3}>[ \t]+.*\n$/.test(chunk.before)) {
            if (command.doBlockquote) {
                command.doBlockquote(chunk, postProcessing, useDefaultText);
            }
        }
        if (/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)) {
            if (command.doCode) {
                command.doCode(chunk, postProcessing, useDefaultText);
            }
        }
    };

    command.doBlockquote = function (chunk, postProcessing, useDefaultText) {

        chunk.selection = chunk.selection.replace(/^(\n*)([^\r]+?)(\n*)$/,
			function (totalMatch, newlinesBefore, text, newlinesAfter) {
			    chunk.before += newlinesBefore;
			    chunk.after = newlinesAfter + chunk.after;
			    return text;
			});

        chunk.before = chunk.before.replace(/(>[ \t]*)$/,
			function (totalMatch, blankLine) {
			    chunk.selection = blankLine + chunk.selection;
			    return "";
			});

        var defaultText = useDefaultText ? "Blockquote" : "";
        chunk.selection = chunk.selection.replace(/^(\s|>)+$/, "");
        chunk.selection = chunk.selection || defaultText;

        if (chunk.before) {
            chunk.before = chunk.before.replace(/\n?$/, "\n");
        }
        if (chunk.after) {
            chunk.after = chunk.after.replace(/^\n?/, "\n");
        }

        chunk.before = chunk.before.replace(/(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*$)/,
			function (totalMatch) {
			    chunk.startTag = totalMatch;
			    return "";
			});

        chunk.after = chunk.after.replace(/^(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*)/,
			function (totalMatch) {
			    chunk.endTag = totalMatch;
			    return "";
			});

        var replaceBlanksInTags = function (useBracket) {

            var replacement = useBracket ? "> " : "";

            if (chunk.startTag) {
                chunk.startTag = chunk.startTag.replace(/\n((>|\s)*)\n$/,
					function (totalMatch, markdown) {
					    return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
					});
            }
            if (chunk.endTag) {
                chunk.endTag = chunk.endTag.replace(/^\n((>|\s)*)\n/,
					function (totalMatch, markdown) {
					    return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
					});
            }
        };

        if (/^(?![ ]{0,3}>)/m.test(chunk.selection)) {
            command.wrap(chunk, wmd.wmd_env.lineLength - 2);
            chunk.selection = chunk.selection.replace(/^/gm, "> ");
            replaceBlanksInTags(true);
            chunk.addBlankLines();
        }
        else {
            chunk.selection = chunk.selection.replace(/^[ ]{0,3}> ?/gm, "");
            command.unwrap(chunk);
            replaceBlanksInTags(false);

            if (!/^(\n|^)[ ]{0,3}>/.test(chunk.selection) && chunk.startTag) {
                chunk.startTag = chunk.startTag.replace(/\n{0,2}$/, "\n\n");
            }

            if (!/(\n|^)[ ]{0,3}>.*$/.test(chunk.selection) && chunk.endTag) {
                chunk.endTag = chunk.endTag.replace(/^\n{0,2}/, "\n\n");
            }
        }

        if (!/\n/.test(chunk.selection)) {
            chunk.selection = chunk.selection.replace(/^(> *)/,
			function (wholeMatch, blanks) {
			    chunk.startTag += blanks;
			    return "";
			});
        }
    };

    command.doCode = function (chunk, postProcessing, useDefaultText) {

        var hasTextBefore = /\S[ ]*$/.test(chunk.before);
        var hasTextAfter = /^[ ]*\S/.test(chunk.after);

        // Use 'four space' markdown if the selection is on its own
        // line or is multiline.
        if ((!hasTextAfter && !hasTextBefore) || /\n/.test(chunk.selection)) {

            chunk.before = chunk.before.replace(/[ ]{4}$/,
				function (totalMatch) {
				    chunk.selection = totalMatch + chunk.selection;
				    return "";
				});

            var nLinesBefore = 1;
            var nLinesAfter = 1;


            if (/\n(\t|[ ]{4,}).*\n$/.test(chunk.before) || chunk.after === "") {
                nLinesBefore = 0;
            }
            if (/^\n(\t|[ ]{4,})/.test(chunk.after)) {
                nLinesAfter = 0; // This needs to happen on line 1
            }

            chunk.addBlankLines(nLinesBefore, nLinesAfter);

            if (!chunk.selection) {
                chunk.startTag = "    ";
                chunk.selection = useDefaultText ? "enter code here" : "";
            }
            else {
                if (/^[ ]{0,3}\S/m.test(chunk.selection)) {
                    chunk.selection = chunk.selection.replace(/^/gm, "    ");
                }
                else {
                    chunk.selection = chunk.selection.replace(/^[ ]{4}/gm, "");
                }
            }
        }
        else {
            // Use backticks (`) to delimit the code block.

            chunk.trimWhitespace();
            chunk.findTags(/`/, /`/);

            if (!chunk.startTag && !chunk.endTag) {
                chunk.startTag = chunk.endTag = "`";
                if (!chunk.selection) {
                    chunk.selection = useDefaultText ? "enter code here" : "";
                }
            }
            else if (chunk.endTag && !chunk.startTag) {
                chunk.before += chunk.endTag;
                chunk.endTag = "";
            }
            else {
                chunk.startTag = chunk.endTag = "";
            }
        }
    };

    command.doList = function (chunk, postProcessing, isNumberedList, useDefaultText) {

        // These are identical except at the very beginning and end.
        // Should probably use the regex extension function to make this clearer.
        var previousItemsRegex = /(\n|^)(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*$/;
        var nextItemsRegex = /^\n*(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*/;

        // The default bullet is a dash but others are possible.
        // This has nothing to do with the particular HTML bullet,
        // it's just a markdown bullet.
        var bullet = "-";

        // The number in a numbered list.
        var num = 1;

        // Get the item prefix - e.g. " 1. " for a numbered list, " - " for a bulleted list.
        var getItemPrefix = function () {
            var prefix;
            if (isNumberedList) {
                prefix = " " + num + ". ";
                num++;
            }
            else {
                prefix = " " + bullet + " ";
            }
            return prefix;
        };

        // Fixes the prefixes of the other list items.
        var getPrefixedItem = function (itemText) {

            // The numbering flag is unset when called by autoindent.
            if (isNumberedList === undefined) {
                isNumberedList = /^\s*\d/.test(itemText);
            }

            // Renumber/bullet the list element.
            itemText = itemText.replace(/^[ ]{0,3}([*+-]|\d+[.])\s/gm,
				function (_) {
				    return getItemPrefix();
				});

            return itemText;
        };

        chunk.findTags(/(\n|^)*[ ]{0,3}([*+-]|\d+[.])\s+/, null);

        if (chunk.before && !/\n$/.test(chunk.before) && !/^\n/.test(chunk.startTag)) {
            chunk.before += chunk.startTag;
            chunk.startTag = "";
        }

        if (chunk.startTag) {

            var hasDigits = /\d+[.]/.test(chunk.startTag);
            chunk.startTag = "";
            chunk.selection = chunk.selection.replace(/\n[ ]{4}/g, "\n");
            command.unwrap(chunk);
            chunk.addBlankLines();

            if (hasDigits) {
                // Have to renumber the bullet points if this is a numbered list.
                chunk.after = chunk.after.replace(nextItemsRegex, getPrefixedItem);
            }
            if (isNumberedList == hasDigits) {
                return;
            }
        }

        var nLinesBefore = 1;

        chunk.before = chunk.before.replace(previousItemsRegex,
			function (itemText) {
			    if (/^\s*([*+-])/.test(itemText)) {
			        bullet = re.$1;
			    }
			    nLinesBefore = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
			    return getPrefixedItem(itemText);
			});

        if (!chunk.selection) {
            chunk.selection = useDefaultText ? "List item" : " ";
        }

        var prefix = getItemPrefix();

        var nLinesAfter = 1;

        chunk.after = chunk.after.replace(nextItemsRegex,
			function (itemText) {
			    nLinesAfter = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
			    return getPrefixedItem(itemText);
			});

        chunk.trimWhitespace(true);
        chunk.addBlankLines(nLinesBefore, nLinesAfter, true);
        chunk.startTag = prefix;
        var spaces = prefix.replace(/./g, " ");
        command.wrap(chunk, wmd.wmd_env.lineLength - spaces.length);
        chunk.selection = chunk.selection.replace(/\n/g, "\n" + spaces);

    };

    command.doHeading = function (chunk, postProcessing, useDefaultText) {

        // Remove leading/trailing whitespace and reduce internal spaces to single spaces.
        chunk.selection = chunk.selection.replace(/\s+/g, " ");
        chunk.selection = chunk.selection.replace(/(^\s+|\s+$)/g, "");

        // If we clicked the button with no selected text, we just
        // make a level 2 hash header around some default text.
        if (!chunk.selection) {
            chunk.startTag = "## ";
            chunk.selection = "Heading";
            chunk.endTag = " ##";
            return;
        }

        var headerLevel = 0; 	// The existing header level of the selected text.

        // Remove any existing hash heading markdown and save the header level.
        chunk.findTags(/#+[ ]*/, /[ ]*#+/);
        if (/#+/.test(chunk.startTag)) {
            headerLevel = re.lastMatch.length;
        }
        chunk.startTag = chunk.endTag = "";

        // Try to get the current header level by looking for - and = in the line
        // below the selection.
        chunk.findTags(null, /\s?(-+|=+)/);
        if (/=+/.test(chunk.endTag)) {
            headerLevel = 1;
        }
        if (/-+/.test(chunk.endTag)) {
            headerLevel = 2;
        }

        // Skip to the next line so we can create the header markdown.
        chunk.startTag = chunk.endTag = "";
        chunk.addBlankLines(1, 1);

        // We make a level 2 header if there is no current header.
        // If there is a header level, we substract one from the header level.
        // If it's already a level 1 header, it's removed.
        var headerLevelToCreate = headerLevel == 0 ? 2 : headerLevel - 1;

        if (headerLevelToCreate > 0) {

            // The button only creates level 1 and 2 underline headers.
            // Why not have it iterate over hash header levels?  Wouldn't that be easier and cleaner?
            var headerChar = headerLevelToCreate >= 2 ? "-" : "=";
            var len = chunk.selection.length;
            if (len > wmd.wmd_env.lineLength) {
                len = wmd.wmd_env.lineLength;
            }
            chunk.endTag = "\n";
            while (len--) {
                chunk.endTag += headerChar;
            }
        }
    };

    command.doHorizontalRule = function (chunk, postProcessing, useDefaultText) {
        chunk.startTag = "----------\n";
        chunk.selection = "";
        chunk.addBlankLines(2, 1, true);
    }
};

function initializeWmd() {
    Attacklab.wmd_env = {};
    Attacklab.account_options = {};
    Attacklab.wmd_defaults = { version: 1, output: "Markdown", lineLength: 40, delayLoad: true };

    if (!Attacklab.wmd) {
        Attacklab.wmd = function () {
            Attacklab.loadEnv = function () {
                var mergeEnv = function (env) {
                    if (!env) {
                        return;
                    }

                    for (var key in env) {
                        Attacklab.wmd_env[key] = env[key];
                    }
                };

                mergeEnv(Attacklab.wmd_defaults);
                mergeEnv(Attacklab.account_options);
                mergeEnv(top["wmd_options"]);
                Attacklab.full = true;

                var defaultButtons = "bold italic link blockquote code image ol ul heading hr";
                Attacklab.wmd_env.buttons = Attacklab.wmd_env.buttons || defaultButtons;
            };
            Attacklab.loadEnv();

        };

        Attacklab.wmd();
        Attacklab.wmdBase();
        Attacklab.Util.startEditor();
    };
}